# Calculate energy from an reaction [closed]

I'm trying to calculate the released energy from a reaction. The radioactive substance polonium decays according to this formula: $$^{210}_{84}\mbox{Po} \rightarrow \mbox{X}+^4_{2}\mbox{He}$$ At first I solved X to be: $^{206}_{82} \mbox{Pb}$

Now when I have the whole reaction, what formula should I use?

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Someone could please edit the question and write the formulas, I couldn't –  Tim LilleSkutt Billström May 23 at 9:20
Do you expect us to visit unknown, quite possibly malware-infected sites and do your work for you? Try harder. –  Deer Hunter May 23 at 10:28
have you thought of energy conservation given the special relativity relation of mass with energy? –  anna v May 23 at 11:41
@DeerHunter and the other downvoter: why such hostility to a new user? You could ignore the question after all. kudos to Nivalth for taking the risk you perceived in the link. –  anna v May 23 at 11:45
@annav - I could ignore the question but not the risk it may be posing to the unwary. To the OP and others: please do not use abbreviated links. There is enough space in the question. –  Deer Hunter May 23 at 12:55